Abstract
AbstractThe cover picture shows the simulated NMR spectroscopic structure of polysialic acid polylactone. The local turn conformation of this right‐handed helix is held by an interresidual C–H···O hydrogen bond. The seams connected by C–H···O hydrogen bonds support the cooperative acid‐catalyzed lactonization of oligosialic acid. The hydrogen bond can be seen as the detonator of a Chinese firecracker. Once the hydrogen bond is formed (just like the ignition of the detonator), the cooperative lactones are formed stepwise in the polysialic acid. The construction of the right‐handed helix was described in a previous article (Eur. J. Org. Chem. 2007, 3648). The observation of the C–H···O hydrogen bond is presented in the article by C.‐S. Chen et al. on p. 3351 ff. The authors thank Ms. Jui‐Wen Sue for the photograph in the cover picture.
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